Insulated glass unit consists of glass panes that are equal in size and hermetically sealed together at the edge. Depending on the number of panes, and, correspondingly, air chambers between them, insulated glass units can be 1- and 2-chamber (the number of airspaces inside the unit).


1-chamber insulated glass unit (4х16х4) is the construction consisting of two glass panes, each 4mm thick,  separated by 16 mm with a spacer. The gas-filled chamber between the panes is hermetically sealed to minimize heat transfer and thus increase the window heat- and noise insulation properties. Traditionally, 1-chamber glass units are 24 mm thick and their R-value of 0,34 м2 oС / W, while the transmission of exterior noise sources is reduced by 34 dB. The disadvantages of 1-chamber insulated glass units include lower noise insulation and R-value compared to the 2-chamber units. As to the advantages, they are more lightweight and transparent. As a rule, 1-chamber glass units are used to save costs for windows coming out on a glassed-in protruding or recessed balcony, or rooms with low noise and heat insulation demands.

22-chamber insulated glass units differ from 1-chamber units in the number of glass panes, spacers and air chambers. It consists of three glass panes and two air chambers, typically produced according to the formula 4-10-4-10-4. However, the glass thickness can vary from 4 to 6 mm, and the spaces between panes can be 6-16 mm wide, plus their width can differ within the same unit. 2-chamber insulated glass unit is recommended for use in all climatic zones of Ukraine. Even manufactured using regular M1 4mm glass, it will ensure unparalleled home comfort and convenience. Such glass units reduce the exterior noise transmission level by 40 dB and are installed in apartments, cottages, office centres etc. Their triple glazing means strong protection against negative climate impacts. Taking into account their considerable energy efficiency, using 2-chamber glass units is totally economically viable.  

1- and 2-chamber insulated glass units comparison table

Glass unit formulaR-valueGlass unit formulaR-value
4 – 16 – 40.374 – 16 – 4E0.59
4 – 6 – 4 – 6 – 40.424 – 6 – 4 – 6 – 4Е0,59
4 – 10 – 4 – 10 – 4k;;p’[0.474 – 10 – 4 – 10 – 4Е0,64

Modern glass production technologies have made a great step ahead and introduced new kinds of special glass, that is typically divided by its purpose into:

  • energy-efficient glass
  • solar control glass
  • multifunctional glass

In production of our reinforced-plastic windows we use standard energy-efficient glass. It has silver coating to reduce heat loss during the cold season and is neutral clear from the inside.

Multifunctional Solar insulated glass unit – the latest achievement of nanotechnology.

  • multifunctional glass with coating of silver and other metals
  • reduces heat loss during the cold season
  • provides reliable sun protection in the hot season
  • neutral clear from the inside
  • moderately glassy from the outside

Insulated glass units comparison table

Glass unit type  Solar transmittance Heat retention
1-chamber regular80%+2%
1-chamber energy-efficient 66%+80%
1-chamber multifunctional Solar42%+87%
2-chamber regular72%+55%
2-chamber energy-efficient60%+154%
 multifunctional Solar maximum  + energy39%+254%